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From: jke@tko.tko.vtt.fi (Kemppainen Jukka)
Newsgroups: comp.protocols.nfs
Subject: Re: Another PCNFS & PKTD.SYS problem
Message-ID: <JKE.91Jan28100822@tko.tko.vtt.fi>
Date: 28 Jan 91 09:08:22 GMT
References: <1261@appli.se> <1305@vaxeline.COM> <1262@appli.se>
Sender: news@ousrvr.oulu.fi
Followup-To: comp.protocols.nfs
Organization: VTT Computer Laboratory, Oulu, Finland
Lines: 48
In-reply-to: niklas@appli.se's message of 24 Jan 91 13:35:23 GMT

niklas@appli.se (Niklas Hallqvist) writes

>Ok, so does anyone know if there is a possibility to redirect the packet
>driver's packets to another IP stack temporarily?  This problem can't be
>rediscovered very seldom, I think, so maybe someone solved it before?
>A possible way would be to have a 'push' & 'pop' executables, who operated
>on a registration stack.  Only the registration on top of the stack would
>get the IP packets.  Then one could have a .bat file saying something like:
>
>push IP
>telbin
>pop IP
>
>when one wanted to start telbin, and PC/NFS had control over the packetdriver.
>Of course NFS wouldn't be accessible from within telbin.  How does this sound?
>


I might have a solution to this situation. I have used PC-NFS together with
packet driver programs (NCSA telbin, lpr, ftp, KA9Q's NOS) succesfully
using following procedure

1) PC-NFS uses PKTD.SYS with interrupt number 0x7e
2) when I want to use some packet driver software, I use specific
   batch files for loading them. The general format for them is:

   @ECHO OFF
   MARK
   C:\DRIVERS\3c503 0x60 5 0x300
   telbin     (or any packet driver software)
   RELEASE

There are two tricks in this procedure:
1) using MARK & RELEASE -programs one can load temporarily (nearly) any
   memory resident software and easily unload it when it is not needed anymore
2) specify different interrupt number for each packet driver software, in the
   above example 0x60 is used.

Of course, one can NOT use PC-NFS services (net drives, net printing, ftp)
when other packet driver software is used. MARK & RELEASE -programs are public
domain (found at least in funic.funet.fi).


Jukka Kemppainen                      phone:  + 358 81 509 475
Technical Research Centre of Finland  fax:    + 358 81 509 680
Computer Technology Laboratory        e-mail: jke@tko.vtt.fi
P.O.Box 201
SF-90571 Oulu, Finland